Properties of the Number 18870

Eighteen Thousand Eight Hundred Seventy

Basics

Value: 18869 → 18870 → 18871

Parity: even

Prime: No

Previous Prime: 18869

Next Prime: 18899

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 5 × 17 × 37

Divisors: 1, 2, 3, 5, 6, 10, 15, 17, 30, 34

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100110110110

Octal: 44666

Duodecimal: AB06

Hexadecimal: 49b6

Square: 356076900

Square Root: 137.36811857195977

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = least k such that the average number of divisors of {1..k} is >= n. A85829

Sequence is {a(3,n)}, where a(m,n) is defined at sequence A111518. A111521

Areas of integer-sided triangles whose area equals 5 times their perimeter. A289221

Number of ways to write 2·n as an ordered sum of n squares of positive integers. A338464

Perimeters of more than one primitive 120-degree integer triangle. A350047

Expansion of ( 1-2·x+3·x² ) / ( 1-4·x+5·x²-4·x³ ). A271897

Column 5 of A060244. A291590

Triangle read by rows. T(n, k) = ∑_j=k..n binomial(n, j) * (-j)^{n - j} * (-1)^{j - k}* A360177(j, k). A360176

Positive numbers k such that k and 4·k are anagrams in base 9 (written in base 9). A23081

Numbers k such that the sum of prime divisors of k is congruent to 2^k (mod k). A51423